Then PAC-3100 is designed to control a linear motor and is intended to be used to lift trunk lids and toppers/tonneau covers. The PAC-3100 has a safety auto reverse feature that will stop downward travel if something would block the trunk lid. If a too much current draw is detected, indicating a blocked condition, the motors will reverse and return to the previous position before they started moving down. The system can learn three user adjustable heights, so the trunk/cover will automatically move to a desired position with the push of a button. There is also an auto move to position feature that will open the trunk/cover when the key is turned off and close the cover when the key is turned on.